Plastic bottle bottom portion



FIG. 1 is a front elevation view of the plastic bottle bottom portion showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a sectional view thereof, taken along line 7—7.

The broken lines are for illustrative purpose only and form no part of the design. 

I claim the ornamental design for a plastic bottle bottom portion, as shown and described. 